Escherichia coli tetracycline efflux determinants in relation to tetracycline residues in chicken.

Abstract:

OBJECTIVE:To screen for Escherichia coli (E. coli) resistant to tetracycline, followed by identification of tet efflux genes by polymerase chain reaction (PCR). In addition, detection of tetracycline residues in chicken livers and kidneys were conducted using high performance liquid chromatography-tandem quadrupole mass spectrometry (HPLC-MS-MS). METHODS:Strains of E. coli were isolated from samples of chicken colon and screened for tetracycline resistance. Tetracycline genes conferring resistance (Tc(r)) were detected by polymerase chain reaction (PCR). Most of the isolates were resistant to tetracycline (97.9%). RESULTS:PCR analysis indicated that Tc(r)E. coli R-plasmids contained tet(A), tet(B) and a combination of both efflux genes. None of the isolates contained other efflux tet genes tet (C, D, E and Y). High performance liquid chromatography-tandem quadrupole mass spectrometry (HPLC-MS-MS), a sensitive technique, was used to detect residues of chlortetracycline (CTC), oxytetracycline (OTC), doxycycline (DC) in chicken livers and kidneys. The samples containing tetracycline residues were at 0.13-0.65 pg/μL levels. CONCLUSIONS:Tetracycline and other antibiotics are commonly used in the poultry and meat production industry for prevention of microbial infections. Multiple antibiotic resistant bacteria in Oman have increased to alarming levels, threatening public health, domestic and may have adverse effect on environment.

journal_name

Asian Pac J Trop Med

authors

S N AB,B M AM,A S AA,A E E,I Y M

doi

10.1016/S1995-7645(13)60125-X

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

718-22

issue

9

eissn

1995-7645

issn

2352-4146

pii

S1995-7645(13)60125-X

journal_volume

6

pub_type

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